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Founder and CEO of Happy Ears. Ultra-runner. Entrepreneur. Sound lover. Karl had been suffering from serious ear problems as a consequence of his great passion for water-sports. An ear infection led to everything from perforated eardrums and total loss of hearing to a balance disorder. In an attempt to prevent more damage, Karl tested a plethora of earplugs available on the market. This was the start of the revolutionary earplug Happy Ears. And to discover the world of noise.